Not sure what your style is, but this is a beautiful and very traditional sunroom. https://www.hometalk.com/431687/refreshed-sunroom
What type of decor are you looking for? Country? Traditional?
Here are lots of sunroom decor ideas...
I always start by collecting several pictures of similar rooms I admire and see which elements reoccur....then I make a list of the most important pieces of furniture, window treatments and accessories I need and like and collect/purchase based on budget. You don't have to buy everything all at once!
How can I remove wallpaper from my bathroom wall, without pulling the drywall off with it?